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Multithreading a Single Instance The default behavior setting directs WCF to create a new service instance for each request In many cases, however, this is not the best approach For instance, if a service has an expensive initialization routine (for example, a constructor that loads data from a database or builds a large in-memory structure), it may not be very ef cient to create a new instance for each service request To create a single service instance that is shared by conshould be used in conjunccurrent threads, The tion with setting indicates that only one instance should be created, whereas the setting directs WCF to execute that instance on multiple threads simultaneously This can provide a signi cant scalability improvement, but the service code must handle synchronization to protect thread local storage Listing 53 shows the service code using and behaviors Note that the attribute is on the class, not the interface This is because the attribute modi es the behavior of the service, not its contract

MIDlets may need to delay or schedule activities to be performed at a later time The MIDP Specification provides two mechanisms to enable this: Timers are used for time-based events while a MIDlet is running For example, a timer used to change the frame being shown in an animation sequence Timers are covered in this section

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The two for in loop blocks we have used here can be simply cut and pasted, and then we can add or remove unary operators and methods from the rst one and binary or n-ary operators and methods from the second one to unimplement whatever methods are not required With this last piece of code in place, if we had two FuzzyBools, f and g, and tried to add them using f + g, we would get a TypeError exception with the message unsupported operand type(s) for +: 'FuzzyBool' and 'FuzzyBool' , which is exactly the behavior we want Creating classes the way we did for the rst FuzzyBool implementation is much more common and is suf cient for almost every purpose However, if we need to create an immutable class, the way to do it is to reimplement object__new__() having inherited one of Python s immutable types such as float, int, str, or tuple, and then implement all the other methods we need The disadvantage of doing this is that we may need to unimplement some methods this breaks polymorphism, so in most cases using aggregation as we did in the rst FuzzyBool implementation is a much better approach

In this section s subsections we will look at custom classes that are responsible for large amounts of data The rst class we will review, Image, is one that holds image data This class is typical of many data-holding custom classes in that it not only provides in-memory access to its data, but also has methods for saving and loading the data to and from disk The second and third classes we will study, SortedList and SortedDict, are designed to ll a rare and surprising gap in Python s standard library for intrinsically sorted collection data types

A simple way of representing a 2D color image is as a two-dimensional array with each array element being a color So to represent a 100 100 image we must store 10 000 colors For the Image class (in le Imagepy), we will take a

Figure 53 shows the output from the client (left) and service (right) As with the previous example, the client output shows that three requests are sent simultaneously and the results were returned ve seconds later The service output shows that only one instance of the service class was created, but that client request was still processed on its own thread The setting directed WCF to spin up only one instance of setting directed the service class, whereas the WCF to allow multiple threads to execute that instance simultaneously

Alarms provide a one-shot time for MIDlets to be launched if they are not already running Automatic launching can be convenient, for example, to register the next appointment in a calendar Alarm-based MIDlet launching is covered in Section 171, "Alarm-Based MIDlet Launch"

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